CN107589774A - It is a kind of based on the method for managing power supply without electric capacity LDO outside piece - Google Patents
It is a kind of based on the method for managing power supply without electric capacity LDO outside piece Download PDFInfo
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- CN107589774A CN107589774A CN201710406976.2A CN201710406976A CN107589774A CN 107589774 A CN107589774 A CN 107589774A CN 201710406976 A CN201710406976 A CN 201710406976A CN 107589774 A CN107589774 A CN 107589774A
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- modules
- ldo
- power supply
- communication lines
- iic communication
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Abstract
The invention particularly relates to a kind of based on the method for managing power supply without electric capacity LDO outside piece, including LDO circuit, digital IIC communication lines；It is characterized in that：Also include VCC modules, VSS modules, the VCC modules, VSS modules are LDO circuit power supply；Also include VDD modules, the VDD modules are LDO output modules；The digital IIC communication lines are powered by LDO, and the digital IIC communication lines also include clock input module CLK modules, reseting module RST modules, and data transmit-receive module is SCL modules and SDA modules；The CLK modules, RST modules, SCL modules and SDA modules are connected with digital IIC communication lines.This method uses the method for carrying out negative-feedback regu- lation to buffer and adding small on-chip capacitance to be engaged, and is effectively improved the load transient effect of system.
Description
Technical field
The present invention relates to power technique fields, and in particular to a kind of based on the method for managing power supply without electric capacity LDO outside piece.
Background technology
With increasing substantially for electronic product, especially notebook computer, mobile phone, portable consumer electronics, automobile electricity
It is sub and communication products to increase substantially so that the application scale rapid growth of power management chip.This trend requirement
The power management that electronic product provides more efficiently solves method.At present variation is shown in whole power management integrated circuit
Development trend.From the perspective of principle of products, the power management chip used in portable type electronic product mainly has three classes at present：
DC-DC switch converters, charge pump and low pressure difference linear voltage regulator (LDO).Compared to switch converters DC-DC, LDO's is excellent
Point is integrated on more convenient piece, and only takes up the area of very little, it is not required that inductive energy storage element, in addition circuit structure compare
Simply.Compared with charge pump, the advantages of LDO control circuit is simple, and noise is small so that be more widely applied.LDO this
A little advantages cause it to be adapted to RF circuits and the analog circuit power supply to noise-sensitive.
In recent years, the direction that electric capacity LDO outside high performance no piece is field of power management research how is designed, is studied
Mainly for be easier to make for integrating on piece, more low-power consumption, to account for chip area less etc..Increase in addition in loop stability
By force, transient response enhancing, pressure difference reduction, operating efficiency raising, the Line and load regulation rate raising of power supply etc. also have
Effect well.
The content of the invention
Technical problem to be solved：
The invention provides a kind of based on the method for managing power supply without electric capacity LDO outside piece, to existing for LDO circuit some be mainly
Error is adjusted caused by manufacturing process, have easily carry out integrating on piece, the spy that power consumption is lower, to account for chip area less
Point.
Technical scheme：
It is a kind of based on the method for managing power supply without electric capacity LDO outside piece, including LDO circuit, digital IIC communication lines；Its feature exists
In：Also include VCC modules, VSS modules, the VCC modules, VSS modules are LDO circuit power supply；
Also include VDD modules, the VDD modules are LDO output modules；
The digital IIC communication lines are powered by LDO, and the digital IIC communication lines also include clock input module CLK moulds
Block, reseting module RST modules, data transmit-receive module are SCL modules and SDA modules；The CLK modules, RST modules, SCL
Module and SDA modules are connected with digital IIC communication lines.
The LDO circuit also includes Miller capacitance Cm and the zero-regulator resistor Rm to be connected with Miller capacitance, the Miller capacitance
It is in parallel with the buffer of LDO circuit after Cm and zero-regulator resistor Rm series connection, frequency compensation is carried out to LDO circuit.
Buffer in the LDO circuit is the buffer of the negative-feedback with dynamic bias.
The complete circuits of LDO that the present invention uses include error amplifier（EA), adjustment element (Pass Element), a reference source
(Reference) and feedback proportional resistor network, along with protection circuits such as current limliting, excess temperature, battery polarity reversals.Wherein,
LDO operation principle is to carry out negative feedback control by exchanging the resistance of homogeneous tube, reaches the purpose for making output voltage keep stable.
From simulation result it is also seen that after with the addition of miller compensation electric capacity Cm, first, can have significantly been separated
Two limits, make dominant pole diminish, and unity gain bandwidth narrows, and phase margin makes moderate progress, but play pendulum, main
If caused by two limits are still suffered from bandwidth.Although beyond bandwidth, the right side half introduced is flat and zero point can also be made
Into potential unstability.
Accordingly, series resistance Rm is added on the basis of foregoing circuit and mainly compensates the second limit.Add series resistance
Post-simulation curve is as shown in fig. 6, it will thus be seen that like this first and second limit significant effect of division, and zero compensation
Second limit positive effect, it is 42.1deg that bandwidth, which can reach l .l MHZ. phase margins, after compensation, it is seen that systematic comparison is steady
It is fixed.
This method use buffer is carried out negative-feedback regu- lation and plus the method that is engaged of small on-chip capacitance, be effectively improved and be
The load transient effect of system.
Brief description of the drawings
The basic LDO linear voltage regulators structures of Fig. 1；
Fig. 2 tradition LDO frequency compensated circuit figures；
The LDO circuit with miller compensation that Fig. 3 present invention uses；
Fig. 4 unencryptions strangle the simulation curve of the LDO stability output of capacitance compensation；
The LDO stability output simulation curve of capacitance compensation is strangled in Fig. 5 encryptions；
The simulation curve that Fig. 6 adds Miller capacitance simultaneously, the LDO stability of Shen connection resistance exports；
The buffer for the negative-feedback with dynamic bias that Fig. 7 present invention uses.
Embodiment
The present invention will be described below in conjunction with the accompanying drawings：As shown in figure 1, the present invention is based on without electric capacity LDO outside piece to be a kind of
Method for managing power supply, including LDO circuit, digital IIC communication lines；It is characterized in that：Also include VCC modules, VSS modules,
The VCC modules, VSS modules are powered for LDO circuit；Also include VDD modules, the VDD modules are LDO output modules；It is described
Digital IIC communication lines are powered by LDO, and the digital IIC communication lines also include clock input module CLK modules, reset mould
Block RST modules, data transmit-receive module are SCL modules and SDA modules；The CLK modules, RST modules, SCL modules and SDA moulds
Block is connected with digital IIC communication lines.
Buffer in the LDO circuit is the buffer of the negative-feedback with dynamic bias.In basic LDO linear voltage regulators
In structure, including error amplifier（EA), adjustment element (Pass Element), a reference source (Reference) and feedback ratio
Example resistor network, along with protection circuits such as current limliting, excess temperature, battery polarity reversals.LDO operation principle is by exchanging
The resistance of homogeneous tube carries out negative feedback control, and reaching makes output voltage keep stable purpose to include error amplifier CEA), adjust
Element (Pass Element), a reference source (Reference) and feedback proportional resistor network, along with such as current limliting, mistake
The protection circuits such as temperature, battery polarity reversal.LDO operation principle is to carry out negative feedback control by exchanging the resistance of homogeneous tube, is reached
To the purpose for making output voltage keep stable.
As shown in Fig. 2 traditional LDO frequency compensation mainly carries equivalent series resistance Resr voltage output end is external
Bulky capacitor Co, the dominant pole of system is made up of Co and output end equivalent load, and zero compensation electricity is produced using Resr and Co
Second limit in road, by rationally designing and optimizing the structure of circuit, the dominant pole of circuit is set to be present in unit gain band
In width, the second pole and zero is mutually compensated for, and other non-dominant poles are in outside unity gain bandwidth, it will ensure the steady of system
It is qualitative.
The frequency compensated circuit that the present invention as shown in Figure 3 uses.The present invention uses and Miller capacitance Cm is added and connected
Resistance Rm is compensated.First analysis adds Miller capacitance Cm situation：Fig. 4 Fig. 5 is respectively to be not added with compensating and adding Miller capacitance
The contrast of steadiness afterwards, from simulation result it can be seen that after miller compensation electric capacity Cm is added, significantly separate
First, the second limit, dominant pole diminish, and unity gain bandwidth narrows, and phase margin makes moderate progress, but are in unstable shape
State, caused by two limits are still suffered from bandwidth.Although beyond bandwidth, the right side half introduced is put down and zero point
Potential unstability can be caused.
It is illustrated in figure 6 while adds Miller capacitance Cm, the simulation curve of series resistance Rm LDO stability output, by
Rm can be blocked in figure and mainly compensate the second limit.After adding series resistance, divide first and second limit significant effect, and
Zero compensation the second limit positive effect, bandwidth can reach l.l MHZ after compensation, and phase margin is its system ratio of 42.1 deg
It is relatively stable.
Such as the buffer that Fig. 7 is the negative-feedback with dynamic bias that the present invention uses.As seen from the figure can use pair
The method that buffer carries out negative-feedback regu- lation and adds small on-chip capacitance to be engaged, so as to can effectively improve the load transient of system effect
Should.Transient response can effectively be improved by M6 negative-feedback and M4 collective effect as can be seen from Figure, when load current is fast
During speed change, Vm5 voltages can be responded quickly, cause M5 to flow through curent change, while M6 grid voltage energy quick response, can
To fill the electric charge let out on adjustment tube grid rapidly so that adjustment pipe grid voltage can be rapidly reached desired value.Shortcoming is that introducing is larger
Quiescent current, this is that transient state is accordingly compromise with low-power consumption, is exactly to sacrifice 50While A quiescent currents, exchange for preferably
Transient response.
Although the present invention disclosed as above with preferred embodiment, they be not for limit the present invention, it is any ripe
This those skilled in the art is practised, without departing from the spirit and scope of the invention, can make various changes or retouch from working as, therefore the guarantor of the present invention
What shield scope should be defined by claims hereof protection domain is defined.
Claims (3)
- It is 1. a kind of based on the method for managing power supply without electric capacity LDO outside piece, including LDO circuit, digital IIC communication lines；Its feature It is：Also include VCC modules, VSS modules, the VCC modules, VSS modules are LDO circuit power supply；Also include VDD modules, the VDD modules are LDO output modules；The digital IIC communication lines are powered by LDO, and the digital IIC communication lines also include clock input module CLK moulds Block, reseting module RST modules, data transmit-receive module be SCL modules and SDA modules；The CLK modules, RST modules, SCL Module and SDA modules are connected with digital IIC communication lines.
- It is 2. according to claim 1 a kind of based on the method for managing power supply without electric capacity LDO outside piece, it is characterised in that：It is described LDO circuit also includes Miller capacitance Cm and the zero-regulator resistor Rm, the Miller capacitance Cm and zero-regulator resistor that are connected with Miller capacitance It is in parallel with the buffer of LDO circuit after Rm series connection, frequency compensation is carried out to LDO circuit.
- It is 3. according to claim 1 a kind of based on the method for managing power supply without electric capacity LDO outside piece, it is characterised in that described Buffer in LDO circuit is the buffer of the negative-feedback with dynamic bias.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710406976.2A CN107589774A (en) | 2017-06-02 | 2017-06-02 | It is a kind of based on the method for managing power supply without electric capacity LDO outside piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710406976.2A CN107589774A (en) | 2017-06-02 | 2017-06-02 | It is a kind of based on the method for managing power supply without electric capacity LDO outside piece |
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| CN107589774A true CN107589774A (en) | 2018-01-16 |
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| CN201710406976.2A Pending CN107589774A (en) | 2017-06-02 | 2017-06-02 | It is a kind of based on the method for managing power supply without electric capacity LDO outside piece |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040164789A1 (en) * | 2002-12-23 | 2004-08-26 | The Hong Kong University Of Science And Technology | Low dropout regulator capable of on-chip implementation |
| CN104133512A (en) * | 2014-06-27 | 2014-11-05 | 小米科技有限责任公司 | Power supply system, power supply control method and power supply control device |
| CN104238612A (en) * | 2014-07-25 | 2014-12-24 | 山东中鸿新能源科技有限公司 | Power supply management module for cloud terminal |
-
2017
- 2017-06-02 CN CN201710406976.2A patent/CN107589774A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040164789A1 (en) * | 2002-12-23 | 2004-08-26 | The Hong Kong University Of Science And Technology | Low dropout regulator capable of on-chip implementation |
| CN104133512A (en) * | 2014-06-27 | 2014-11-05 | 小米科技有限责任公司 | Power supply system, power supply control method and power supply control device |
| CN104238612A (en) * | 2014-07-25 | 2014-12-24 | 山东中鸿新能源科技有限公司 | Power supply management module for cloud terminal |
Non-Patent Citations (1)
| Title |
|---|
| 张培剑: "基于智能IC卡的小型电源管理模块设计", 《中国优秀硕士学位论文全文数据库》 * |
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Application publication date: 20180116 |